Roof insulation and the EPC in Flanders

An uninsulated pitched roof or a bare flat roof is a large loss area. Insulation keeps heat in the house for longer. How far the EPC then moves depends on the rest of the building: walls, windows, heating and the starting point.

A roof check therefore does not promise a points gain. It proposes a build-up that fits that roof.

On a slope, insulation sits between or above the rafters, together with an underlay that still works. Insulation against a wet or torn underlay traps moisture.

On a flat roof, insulation belongs in the build-up of the deck, with the waterproofing above or below it depending on the system. An extra layer indoors, under a cold flat roof, is often the wrong answer.

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First, whether the roof is dry and strong enough. Insulating a leak speeds up timber rot. In greater Antwerp the job is often both: tiles or slates on the main house, EPDM on the extension.

A roof check looks at the two together, so insulation is not added to a roof that first needs repair or replacement.